let's take a look at a different Chart....this time, Phili SemiCon Index or better known as SOX...
see, how this baby has shown great strength, silently since late Apr. Remember that Nazdaq is highly correlated this SOX index, which measures SemiCon related companies...which is also Techs...
Before that, do a recap...a couple of points already pointed out by bertyeo...
NYSE volume was lighter by 3% on Thurs trade vs Wed. However, Nazdaq was 4% heavier in turnover. This solid Candle can be seen as a Accumulation Day. Thurs' Naz P/V movement can be attributed to Institutional buyings bcos, it rose substantially and ended intraday high. Retailers do not have such powder. Naz's Adv/Dec Ratio was 4 to 1, while NYSE Adv/Dec ratio was 7 to 2... both showed buying interests.
One big reason for Naz superb strength last night, was SOX.....which rose 2.1%. What's more critical is that it is stayed above 200MA. This is the 1st time since Nov07.... It first crossed MA50 in mid Apr08, but nothing beats crossing MA200, as a bullish indicator... one day does not make a rally, 2 days in a row, shows better strength...u see it, so do millions of other traders... dont fight the trend for now..
so, just be aware that SOX has awaken and with it, means, several semicon and tech stocks... the same applies to Nazdaq-100 Index (NDX)...very similar pattern, if not even more pronounced positively.
again, nothing goes up or down in a straight line.... patience is required to find a good entry point. but in a short term, things are looking up....who knows what will happen in the mid term....

Next, i cannot stress enough the danger of a low low VIX, which has always been a bane to any rally potential.
Finally, I touch on rising Oil prices, which is commonly seen as a dampener to upside push for equities...
Yesterday, oil dropped 3% initially, only to recover all losses by end of day....Oil Service HOLDRs Trust (OIH) shows this...and more importantly, it shows that a NEW high has been achieved on HIGH volume... now, we will never know if it will head higher...but this new high price was achieved after several attempts lately. We wont know. We just need to be watchful of this is a key chart.

Good luck folks...